fix: integration test

[suchapalaver]

This PR fixes a hidden test bug discovered during local testing and prevents similar issues by adding integration tests to CI.

Fix Test Bug and Add Integration Testing to CI

🎯 Problem

While setting up local testing using the existing scripts/integration_tests.sh, we discovered:

1. Hidden Test Bug: testSignerStillThawing() was failing with a timestamp mismatch - the test was incorrectly using block.number instead of block.timestamp
2. No CI Coverage: Integration tests existed but weren't running in CI, so this bug went undetected
3. Dependency Issues: The integration script needed improvements for Node.js version management

🔧 Solution

1. Fixed Test Bug

• Discovery: Found during local integration testing that testSignerStillThawing() was failing
• Root Cause: Test expected SignerStillThawing(uint256,uint256) error with (block.number, thawEndTimestamp)
• Contract Reality: Error is thrown with (block.timestamp, thawEndTimestamp) - both are timestamps
• Fix: Updated test to use block.timestamp to match actual contract behavior

2. Enhanced Integration Script Robustness

• Node Version Management: Proper switching between Node 16 (Graph contracts) and Node 18 (TAP contracts)
• Dependency Installation: Automatic yarn installation for each Node environment
• Deployment Fixes: Added --broadcast flags and ETHERSCAN_API_KEY handling

3. Added Integration Tests to CI

• Preventive Measure: Ensure integration bugs like this are caught automatically
• New CI Job: integration-tests job runs after unit tests pass
• Full Deployment Validation: Tests complete contract deployment flow
• Environment Setup: Proper nvm, Node.js, and yarn installation

📝 Changes Made

Files Modified:

• test/Escrow.t.sol - Fixed test to use correct timestamp parameter
• scripts/integration_tests.sh - Enhanced Node version management and deployment robustness
• .github/workflows/test.yml - Added integration test job to catch issues in CI

[suchapalaver]

@tmigone I wanted to ask you about this change. Does this make sense? The script hadn't been part of CI and was written 2 years ago.

[suchapalaver]

Thanks @tmigone!